find-in-docker

#!/bin/bash
#
# find-in-docker: a "find" utility that spans over all Docker containers
#
# This can be useful if Docker has stopped all containers after a reboot,
# and lack of tagging makes it difficult to establish what image holds
# certain data.
#
# It does not matter if containers are running for any of the images.
# New temporary containers will be started for the purposes of these
# tests.
#
# Another assumption is that "find" is installed in all your containers.
# This comes with all its power, including "-exec" facilitation.
#
# This is an example of how I used it to look for DEFAULT usage changes
# made in an ASN.1 specification within the KIP project:
#
# fid / -name kip\* -exec grep -sr DEFAULT {}/asn1/kip-document.asn1 \;
#
# The command will be printed without the escapes, but that is okay.
#
# From: Rick van Rein <rick@openfortress.nl>


fid() {
	docker images | sed -E -e 1d -e 's/ +/ /g' | cut '-d ' -f 3 | \
	while read IMAGE
	do
		echo $IMAGE -- find "$@"
		docker run -t --rm $IMAGE find "$@"
	done
}

fid "$@"